Hydraulic powered mobile concrete pump assembly



Oct. 18, 1966 M. L. SMITH 3,279,383

HYDRAULIC POWERED MOBILE CONCRETE PUMP ASSEMBLY Filed Jan. 6, 1965 7 Sheets-Sheet l ATTORNEY M. L. SMITH Oct. 18, 1966 HYDRAULIC POWERED MOBILE CONCRETE PUMP ASSEMBLY Filed Jan. 6, 1965 '7 Sheets-Sheet 2 INVENTOR Max L. Sm/fh Oct. 18, 1966 M. L. SMITH 3,279,383

HYDRAULIC POWERED MOBILE CONCRETE PUMP ASSEMBLY Filed Jan. 6, 1965 '7 Sheets-Sheet 5 INVENTOR Max L. Sm/fh ATTORNEY M. L. SMITH HYDRAULIC POWERED MOBILE CONCRETE PUMP ASSEMBLY Filed Jan. 6, 1965 '7 Sheets-Sheet 4 ATTORNEY M. L. SMITH Oct. 18, 1966 HYDRAULIC POWERED MOBILE CONCRETE PUMP ASSEMBLY Filed Jan. 6, 1965 7 Sheets-Sheet 5 5 mm\ m& 93 n@ ME J. H l L 3 m 5 w@ v9 wk 7 KS All INVENTOR Max L. Sm/fh MWQ ATTORNEY M. L. SMITH Oct. 18, 1966 HYDRAULIC POWERED MOBILE CONCRETE PUMP ASSEMBLY 965 Filed Jan. 6, 1

7 Sheets-Sheet 6 llv INVENTOR Max L. Sm/f/r BY W ATTORNEY 7 Sheets-Sheet 7 IN VENTOR M. L. SMITH HYDRAULIC POWERED MOBILE CONCRETE PUMP ASSEMBLY Oct. 18, 1966 Filed Jan. 6, 1965 United States Patent assignor to Burnup West Palm Beach, Fla., a corporation This invention relates to a hydraulic powered concrete pump assembly, and has for an object to provide an improved concrete pump assembly which is hydraulic operated and electrically controlled.

A further object of this invention is to provide a mobile hydraulic powered concrete pump wherein the concrete pumping parts are completely hydraulically actuated and wherein the pump is electrically cycled, wherein the hydraulic power is provided by power takeoif means from the power engine of the vehicle, and the vehicle engine battery provides the source of power for cycling the hydraulic action.

A further object of this invention is to provide a hydraulic powered concrete pump wherein the concrete pump piston has water feed means for use while in operation to feed water as a lubricant to the area between the concrete pump piston and its cylinder and as a cleaning means for the piston and cylinder area, as well as built in water spray means for a hopper for feeding the concrete to the concrete pump piston and cylinder.

Yet a further object of this invention is to provide a concrete pump employing the principles used in reciproeating pumps using hydraulic fluid and hydraulic cylinders as the force to move the pistons creating the pumping action on the concrete.

Still a further object of this invention is to provide two separate concrete pumping assemblies for pumping concrete through a single concrete transport conduit, wherein the two separate assemblies are so tied together than either can be operated independently, or be operated in either in-phase or out-of-phase relation, and maintain perfect coordination.

Yet a further object of this invention is to provide a concrete pumping assembly whose operation is electrically cycled and hydraulically powered.

Yet a further operation of this invention is to provide a concrete pumping assembly that is electrically cycled and controlled, and has manually controllable switch means connectable into its electrical cycling which may be used to reverse the operation in event of a jam in the concrete.

Still a further object of this invention is to provide a pair of separably operable concrete assemblies which are also operable in coordination, and in either case, pump concrete through a common concrete transport conduit.

A further object of this invention is to provide a fully hydraulic pump, using the hydraulic principle and thus have fewer moving parts, fewer breakdowns, fewer delays, than a partly or fully mechanical pump with its geared operating or mechanical cycling elements.

Still a further object of this invention is to provide a mobile hydraulic concrete pump mounted on a vehicle having a transport engine using a power takeoff for providing hydraulic power and using the battery normally present on such vehicle for cycling the hydraulic operation of the pump.

Still a further object of this invention is to provide an improved piston and rubber cup piston rings therefore, with water passages through the piston to and from between the rubber cup piston rings, for pumping the concrete. It will be understood that the term rubber refers to any suitable elastic compressible material, such as 3,279,383 Patented Oct. 18, 1966 natural or synthetic rubber, or other suitable plastic material.

In brief, this invention is a portable pump for pumping wet concrete through a flexible hose to a desired location. The pump has two independent concrete sucking and pushing pistons and cylinders, which are hydraulically operated, but electrically cycled for either sequential operation of a common delivery hose, or for simultaneous pumping operation, or for shutting down one pump piston and'cyinder while the other may continue in operation, or for reversing the operation when necessary. Furthermore, water is delivered to each pumping piston, for lubricating the piston within the cylinder during the pumping cycle, and for washing the cylinder at the end of the cycle. The pump is preferably mounted on a self-propelled vehicle, such as a specially converted standard one ton truck, and the battery of the truck and the engine of the truck are used for power for electrically cycling the operation as well as for powering the hydraulic operating means for actuating the concrete pump. A readily washable hopper is provided for feeding concrete to the pump and quick detachable means are provided for attaching or detaching a Y connection both to each separate pump and to a common concrete delivery hose. A special improved rubber cup piston ring, in pairs, is provided for a special improved piston for each concrete pump piston, and telescopic sleeves are provided for feeding water through the pistons, while in operation, to the area between two spaced apart piston rings on each piston. A readily replenishable water supply is provided, and a hydraulic fluid supply is also provided also in a tank, and a reel is located about one of the tanks for storing the concrete pumping hose when not in use. Gauges and controls are located in a location convenient for an operator.

With the above and related objects in view, this invention consists in the details of construction and combination of parts, as will be more fully understood from the following description, when read in conjunction with the accompanying drawing, in which:

FIG. 1 is a perspective view of the concrete pump mounted on a truck.

FIG. 2 is a top plan view of the concrete pump per se, certain operating details being omitted for clarity.

FIG. 3 is a side elevational view of FIG. 2.

FIG. 4 is a sectional view on an enlarged scale, through one hopper valve, and associated parts, in pump cylinder filling position.

FIG. 5 is a similar view in concrete pumping position.

FIG. 6 is a sectional view on line 6-6 of FIG. 1, showing the hopper washing pipe.

FIG. 7 is a view of a pair of pumping cylinders, partly broken away, in section, approximately on line 77 of FIG. 3, on a medium scale.

FIG. 8 is a sectional view on line 88 of FIG. 7, on a more greatly enlarged scale.

FIG. 9 is a sectional View on line 9-9 of FIG. 7, on a similarly enlarged scale.

FIG. 10 is a sectional view on line 1010 of FIG. 8, likewise on an enlarged scale.

FIG. 11 is a diagrammatic view showing the water circulation.

FIG. 12 is a diagrammatic view showing the circulation of the hydraulic fluid.

FIG. 13 is a diagrammatic view of the electrical circuit for controlling the hydraulic valves.

FIG. 14 is a fragmentary'view of one concrete pump piston rubber cup in position on the face plate of the piston before it has been inserted in the concrete pump cylinder, on a larger scale.

There is shown at 10 the hydraulic powered mobile concrete pump of this invention mounted on a standard production one ton truck chassis 12 of a conventionally powered truck 14, the pum being mounted on four pieces of channel iron 16 placed horizontally so as to form the carrier for the parts of concrete pump 10. These channel irons 16 are positioned with appropriate mounting lugs so as to set inside the truck chassis frame.

Referring to FIG. 1, behind and close to the truck cabin 18 there is mounted a rectangular water tank 20 of approximately 150 gallons capacity, having a sight glass 34 forming a necessary part of the concrete pump 10. An electric control box and panel 22 is mounted thereagainst so as to be convenient to an operator who may stand on either an upper level runway 24 or a lower level rear runway 26, a quarter circular shield 28 being mounted over and concealing some of the operating parts, hereinafter described, the runways 24 and 26 and shield 28, but not the control box and panel 22, being duplicated on the opposite side of the truck chassis 12.

Beneath the water tank 20, there is mounted on the truck chassis 12 a water pressure pump 30 and a fluid pressure pump 32. A cylindrical hydraulic fluid reservoir 36 approximately twenty-four inches in diameter with a capacity of approximately 110 gallons, is supported on the upright stanchions 38 of a cradle operatively supported by the truck chassis 12. Rotatably bearing about this cylindrical reservoir 36 is a reel or spool 40 on which is stored a rubber hose or flexible conduit 42, approximately three inches in diameter and 150 feet long, for conducting the pumped concrete from the concrete pump 10 to the point where the concrete is being used. The hose 42 is readily unreeled from the reel or spool 40 and connected when it is to be used. Behind the rear cradle stanchions 38, there is provided a funnelshaped concrete input hopper 44 having twin feed spouts 46 at the bottom thereof. Around the top of the oval shaped hopper 44 there is provided a water spray pipe 48 having a series of spray holes 50 on three inch centers along its bottom to discharge water on the inside of the hopper 44, both to wash the hopper 44 at the end of a concrete pumping operation as Well as to add more water to the concrete mix, when necessary. The water spray pipe 48 is fed from the water pump 30 and the water tank 20 by a water conduit 52, as later described and shown in FIG. 11. The water pump 30 and the hydraulic pressure fluid pump 32 are each powered from a power divider or power takeoff 148 from the engine of the truck 14, and the electrical control box and panel 22 receives its electrical power from the battery, usually 12 volts, normally present on the truck 14 for powering the lights and ignition, if present, of the truck engine, thus eliminating the need for a separate power or electricity source.

Each hopper spout 46 is connected to a valve housing 54 which in turn is connected to both a concrete sucking and pumping cylinder 56 and to one six inch diameter arm 58 of a Y shaped concrete feed conduit 57. The common discharge leg 59 of the Y-shaped feed conduit 58 is removably clamped, as by a Victaulic quick action clamp 60, to a tapered spout 62, tapering from six inches down to three inches. At the three inch end, a coupling 64 is provided for removably securing one end 66 of the concrete flexible hose or conduit 42.

A similar quick action Victaulic clamp 68 detachably connects the Y input arm 58 to an adjustable female threaded coupling 70 which also secures a valve seat 72 in position, an O-ring 74 being provided between the valve seat 72 and the coupling 70, a male threaded coupling 76 being bolted or otherwise secured to a flange 78 of valve housing 54 surrounding an output feed port 80, through which the concrete mix 82 is fed from the cylinder 56 to the Y feed arm 58. The spout 46 of hopper 44 is connected in an identical manner to the input port 84 of housing 54, and hence the same reference numerals are applied to the valve seat and connecting parts. Another Victaulic clamp 69, of appropriate size, connects the valve housing 54 to the concrete sucking and pumping cylinder 56. This cylinder 56 is of ten-inch inside diameter, thirty-six inches long, and is made of mechanical steel and then hard chrome plated on the inside to provide a long wearing surface. Fixedly secured on a valve control pivot shaft 86 extending through the side of valve housing 54 is a globe valve 88 which is controllably oscillated by the pivot shaft 86, between a position connecting the input port 84 from the hopper spout 46 through the valve housing 54 to the sucking action of the concrete sucking and pumping cylinder 56 while closing off the output port therefrom, as shown in FIG. 4, and a position closing off the input port 84 from the hopper spout 46 and connecting the output port 80 to the Y feed conduit arm 58, as shown in FIG. 5.

The globe valve 88 is a half sphere, cast of stainless steel with the pivot shaft 86 being of high alloy steel welded and machined for accuracy, and this globe valve 88 is oscillated in an arc of approximately one-hundredten degrees from one valve seat 72 to the other valve seat 72. The valve housing 54 is fabricated of standard ten inch pipe on which the seat housing or male couplings 76 are bolted.

The globe valve shaft 86 is oscillated between its positions by an arm 90 secured thereto at one end and pivotally connected at 92 at its other end to the end 94 of a piston rod 96 of a hydraulically movable piston 98 within a valve control hydraulic cylinder 100 which, in turn, is cyclically controlled by a solenoid controlled push-pull valve 102. The electrical circuit for cycling the globe valve 88 in accordance with the movement of the concrete sucking and pumping piston 104 moving within the concrete sucking and pumping cylinder 56 will be described later in connection particularly with FIG. 13.

This concrete moving piston 104 is made of an annular spacer 105, preferably of aluminum, secured between a pair of steel piston face plates 106. Mounted on the periphery 107 of each face plate 106 is a rubber cup piston ring 108 shaped, when not inserted in the cylinder 56, as shown in detail in FIG. 14. When inserted in the cylinder 56, the rubber cup piston ring assumes the shape shown in FIG. 8.

Each faceplate 106 is provided with a peripheral rectangular channel 109, whose back wall 110 is prefer-ably exactly half way between the opposite sides of each face plate 106, and whose back lip 111 is higher than its front lip 112. When the concrete cylinder 56 is ten inches in inside diameter, the preferred dimensions are as follows: The face plates are five-sixteenths inch thick, with the channel back wall 110 located at five-thirty-seconds inch from both the front and back sides of the steel face plates 106. The channel 109 is three-thirty-seconds inch wide, and the front lip 112 two-thirty-seconds inch wide. The diameter of the face plate at the bottom 113 of the channel 109 is 9.6875. The diameter of the front lip 112 is 9.75. The diameter of the back lip 111 is 9.8125".

The rubber cup piston ring 108 is held on the periphery 107 of each of the face plates 106 by a rearwardly extending flange 114 Whose inner face 115 is complementary in shape and size to that of the face plate channel 109 and back and front lips 111 and 112. At the rear edge 116 of the rubber cup piston ring 108, whose diameter is 10.07, the peripheral surface 117 angles inwardly to a diameter of 10.38" at a point 118 located .5 from its annular rear surface 119, which annular rear surface 119 is in the same plane with the rear surface of the faceplates 106. Then, from this inward point 118, the rubber cup piston ring periphery angles outwardly at 120 to a diameter of 10.5" at the outer edge 121 of its annular front surface 122, which annular front surface 122 is parallel to and located 1" from its rear surface 119. This annular front surface 122 is .5" in width and parallel to its annular rear surface 119. The inner edge 123 of this annular front surface 122 thus has a di ameter of ten inches. From here, the front surface 124 angles rearwardly to meet an inner edge 125 whose diameter is 8.25". This inner edge 125 is also the inner edge of an annular surface 126 parallel to its rear face 119 and thus to the face of the front plate on which it is mounted. Annular surface 126 has an outer diameter of 9.75", the same as the diameter of the front lip of the face plate, and from here on, as already described, it is complementary to the channel 109 and outer peripheral lips 111 and 112 of of the steel face plate at 106 or 107, and thus of the same diameters already set forth.

Secured to the rear face of the rear face plate 106 by the same stud bolts 127 which extend through both face plates 106 and the intervening aluminum spacer 105 is a pusher plate 129 into which the four stud bolts 127 are threaded. The aluminum spacer 105 is 3" thick and 8 in diameter, and the pusher plate 129 is of the same 8" diameter. A piston connecting rod 128 is threadedly secured in a counterbore 130 of a center boss 131 on the pusher plate 129, the inner smaller bore being threaded at 132 to attach to the threaded reduced neck 133 extending from the shoulder end 135 of the piston connecting rod 128, which shoulder end 135 seats in the counterbore shoulder 137.

Extending partly about the boss 131 is a water'tube anchor plate 139 secured to pusher plate 129 by studs 141. The outer telescopic tubes or sleeves 170, later d scribed, are firmly secured, :as by welding or the like, to a boss 143 extending from these anchor plates 139. Tapped at one of their ends into these sleeves 170 are small curved conduits 145 whose other ends 147 are tapped at 147 into water conduit passages 149 through the pusher plate 129, the rear face plate 106 and the aluminum spacer 105 to the outer periphery 155 of the spacer 105 between the front and rear rubber cup piston rings 108. The water follows the path shown by'the arrows 151 and 153, entering at arrow 151, about the periphery 155 of piston spacer 105 in both directions and out at arrows 153, thus continuously circulating and washing as well as lubricating the inner surface of the concrete pumping cylinder 56.

The concrete pumping and sucking piston 104 is reciprocated within its cylinder 56 by means of the piston rod 128 threaded into the counterbored boss 131 of the pusher plate 129. The other end of piston rod 128 is secured to a hydraulically actuated piston 134 within a hydraulic cylinder 136, and its cycling is controlled by solenoid controlled hydraulic valves 138 by means of pressure fluid conduits 140 leading to opposite ends of the cylinder 136, the globe valve actuating piston 98 within hydraulic cylinder 100 being likewise connected by fluid pressure conduits 142 leading from its solenoid controlled valve 102 to opposite ends of its hydraulic cylinder 100.

Referring to FIG. 12, hydraulic power for actuating the globe valve actuating cylinders 100 and the concrete sucking and pumping pistons 104 within cylinders 56 is provided by hydraulic fluid circulating from the hydraulic fluid reservoir 36 of approximately one-hundred-fifty gallons capacity, flowing at the rate of approximately eightytwo gallons per minute, through filters 146 to the triple gear hydraulic pump 32 operated by a power takeoff 148 from the truck engine, through conduits 150 to each of the solenoid controlled valves 102 and 138 and their conduits 140 and 142 to their hydraulic cylinders 100 and 136 and then by the conduits 152 the fluid returns to the reservoir 36. Hydraulic pressure gauges 154 and avacuum gauge 156 for indicating the suction on the intake side of the hydraulic pump suitably connected are located on the panel 22 for observation by an operator on either runway 24 or 26.

Referring to FIG. 11, water is fed from the tank 20 through a main cutoff valve 158 to the centrifugal water pump 30, operating at approximately twenty-seven gallons per minute, through a metering valve 160 in conduit 52 to the spray pipe 48 of hopper 44, and also through two other metering valves 162 in conduits 164 to the inside of the concrete sucking and pumping pistons 104, an excess water return line 166 being connected between conduits 164 and the water tank 20. The centrifugal water pump 30 is also operated by the power takeoff 148.

The conduits 164 terminate in inner telescopic tubes 168 extending into outer telescopic tubes 170 connected to the water conduits 1 45 into hollow concrete sucking and pumping pistons 104. Similar inner and outer telescopic tubes provide for return of waste water from hollow pistons 104 to waste discharge at 172. The water tank 20 may be replenished from time to time by a water hose from any suitable source during use, through the refill cap 174, the sight glass 34 serving to alert the operator as to when refill is needed. Water from spray pipe 48 serves to clean the hopper 44 after the concrete pumping is stopped, as well as to add extra water to the concrete mix whenever needed. Water through the concrete piston 104 serves to lubricate the piston in its thirty-six inches of travel through its cylinder 56, as well as to clean it after pumping is stopped.

The hopper 44 has two feed spouts 46, feeding through the two cylinders 56 and Y feed pipe 57 to a delivery concrete conduit 42. Each cylinder 56 and all its details provides a complete concrete delivery system, which is cycled as set forth in the electrical diagram of FIG. 13 for either coordinated operation, whereby each cylinder 56 feeds alternately to its leg 58 of Y feed conduit 57, so as to provide a substantially continuous stream of concrete flowing through the concrete conduit 42. However, both cylinders 56 may be cycled to pump simultaneously, as when the concrete must be delivered to a great height, thus delivering the concrete in pulses of greater power. It may also be cycled to stop the operation of either cylinder, while continuing the operation of the other cylinder, or may be cycled to reverse the operation of either cylinder in case the concrete jams the cylinders. This cycling is controlled by the operator through the switches on the control panel 22, who will know when other than regular automatic alternate pumping cycle is needed from scanning the gauges 154 and 156 on the panel 22.

All the hydraulic cylinders, valves and pump of the hydraulic system are of standard manufacture and design, and also, all parts used in the electrical control system are also of standard manufacture and design.

Concrete pump electrical switching system This system is unique in that it employs two separate systems so tied together that either can operate independently or be operated as a reciprocating unit, and maintain perfect coordination.

In order to start an explanation of the operation of the electrical systems as related to the pump it is necessary to assume that a certain movement is in progress, one onehalf or side of the pumping cycle will be first described.

It is assumed that the main cylinder 56 of the pump is in its push stroke, pushing to the rear and discharging the concrete 82 int-o the hose 42.

To illustrate the electrical system so arranged as to be supplying power to the proper valve, reference is made to the schematic diagram in FIG. 13.

The limit switches S1 and 5-2 are snap-action, singlepole, double-throw switches which remain in a closed contact position until a mechanical force moves them to the other closed contact position.

Relay Rl is a four-pole, single-throw relay while R2 is a six-pole, double-throw relay.

The manual switches MS-l, MS-Z, and MS-3 are double-pole, double-throw switches.

The valves Vl, V2, V3 and V4 are the pilot solenoid valves, which control the flow of hydraulic fluid to the proper hydraulic cylinder, va'lves V1 and V4 being valves 102 for positioning globe valve 88, and valves V2 and V3 being valves 138 for operating hydraulic piston 134 to actuate concrete piston 104.

The following would be the position of valves and switches to give the movement previously mentioned:

S1Closed in push position (in solid outline).

S2Closed in push position (in solid outline).

R1Closed (or activated) position (in solid outline).

R-2Closed (normal closed) position (in solid outline).

MS-l, MSZ, MS3, and MS7 are in lock position. (The other position on MS1, MS2, MS3 is used only to reverse the operation in event of a jam in the concrete. This is also a unique operation.)

V1Neutral position (in solid outline).

V2Activated in push position (in solid outline).

MS8Gr-ounded to one operational side (in dotted or dash outline).

As the main hydraulic piston 104 in cylinder 56 reaches its limit of travel in the push stroke, it then trips limit switch S1 to the pull position (in dash outline). This in turn activates the R-2 relay closing the normally open contacts (as shown in dash outline position). This lets the valve V2 go to the neutral position (in dash outline) and activates valve V-I from the neutral to the push position (in dash outline). The valve V-l in this position moves the concrete globe valve 88 of the concrete pump 56 to the intake position shown in FIG. 4.

As the small hydraulic piston 98 in cylinder 1% on the concrete globe valve 88 reaches the end of its stroke and has moved the concrete globe valve 88 to its intake position, it then trips limits switch 8-2 to the pull position (in dash outline). This action returns V-1 to its neutral posit-ion (in full outline) and activates V2 to the pull position (in dotted outline). There is no relay movement at this time.

As the main concrete piston 104 in cylinder 56 completes its movement toward the front of the truck 14 on its intake stroke it then trips limit switch S1 to the push position (in full outline). This deactivates R-2 letting it drop to its normally closed position (in full out-line). This returns V-2 to its neutral position (in dash outline) and activates V-l to the pull position (in dotted outline).

As the small hydraulic piston 98 in cylinder 100 on the concrete globe valve 88 has moved the globe valve 88 from the intake position of FIG. 4 to the pump position of FIG. 5, it then trips limit switch 3-2 to the push posi- 'tion (in solid outline). This returns valve V-1 to the neutral position (in solid outline) and activates valve V-Z to the push position (in solid outline). This places us back at the point where we started with the pump piston 104 in cylinder 56 in pump or push stroke shown in FIG. 5.

This description of operation covers only one side or half the pumping cycle. To use both sides and coordinate the movement it was necessary to add relays R-1 and R-3. These relays furnish the continuity to operate solenoid valve V-Z in the push position only when activated by the tripping of the main cylinder switch (S1 or S3) on the opposite side.

Switch MS8 controls the single cylinder operations of the machine and is selective as to which side (dash outline or dotted outline) is desired.

Switch MS7 is the main power switch into the control panel. All components use a single voltage for operation (normally 12 volt D.C.), usually the battery of the truck 14.

The operation of the hydraulic powered mobile concrete pump of this invention is believed to be obvious from the above description. As will be apparent, it may use either pumping and sucking piston and cylinder independently of the other, or either one may be reversed in case the concrete 82 should jam, or both pumping and sucking pistons and cylinders may be coordinated to pump alternately and thus provide a substantially continuous flow, or to pump simultaneously, to thus provide much greater pumping power and thus, in start and stop pulses,

8 pump the concrete a greater distance or to a greater height.

Although this invention has been described in considerable detail, such description is intended as being illustrative rather than limiting, since the invention may be variously embodied, and the scope of the invention is to be determined as claimed.

Having thus set forth and disclosed the nature of this invention, what is claimed is:

1. A hydraulic powered concrete pump assembly comprising a concrete supply hopper, a concrete pump cylinder, a discharge concrete conduit, a valve seat port connecting said hopper to said concrete pump cylinder, 2 second valve seat port connecting said concrete pump cylinder to said discharge conduit, a valve operable between positions opening either valve seat port while closing the other valve seat port, a concrete sucking and pumping piston in said concrete pump cylinder, a first hydraulic cylinder, a hydraulically reciprocable piston in said first hydraulic cylinder, a piston rod connecting said first hydraulic cylinder to said concrete sucking and pumping piston, a second hydraulic cylinder and hydraulically reciprocable piston therein, means linking said second hydraulically reciprocable piston to said valve and operating said valve between said valve seat ports, a hydraulic pressure means, a two-Way solenoid valve means connecting said hydraulic pressure means to said first hydraulic cylinder and a second two-way valve means connecting said hydraulic pressure means to said second hydraulic cylinder, and limit switch means operatively connected to said concrete sucking and pumping piston and said valve operating hydraulic piston for actuating said solenoid valve means.

2. The assembly of claim 1, said valve being a globe valve.

3. The assembly of claim 1, and water lubricating and cleaning means comprising a water supply means, Water feed means connecting said water supply means to said reciprocable concrete sucking and pumping piston, a plurality of piston rings on said concrete sucking and pumping piston bearing against the inner surface of said pump cylinder, said concrete sucking and pumping piston having water conduit means connecting said water feed means to the areas between said piston rings thereon.

4. The assembly of claim 3, said water feed means including water pressure means and flow control valve means.

5. The assembly of claim 3, and a wash down water spray pipe on said hopper, said water feed means being connected to said hopper spray pipe.

6. The assembly of claim 3, said water feed means in. cluding telescoping Water feed tube means connecting to said concrete sucking and pumping piston.

7. The assembly of claim 3, and water discharge means connected to said piston conduit means.

8. The assembly of claim 4, said water feed means including an excess water return conduit connected thereto between said water pressure means and said concrete sucking and pumping piston.

9. The assembly of claim 6, and telescoping water discharge tubes connected to said piston Water conduit means.

10. The assembly of claim 1, said hydraulic pressure means including a hydraulic fluid reservoir, fluid conduit means connecting said fluid reservoir through said solenoid valve means to said hydraulic cylinders and back to said reservoir, and fluid pressure creating pump means in said fluid conduit means between said reservoir and solenoid valve means.

11. The assembly of claim 10, said fluid pressure creating pump means including one gear hydraulic pump for said solenoid valve means to said concrete sucking and pumping piston hydraulic cylinder, and a second gear pump for said solenoid valve means to said valve operating hydraulic cylinder.

12. The assembly of claim 1, and a second similar assembly, and electrical control means connected to said solenoid valve means actuating both said assemblies in out-of-phase relation.

13. The assembly of claim 1, and a second similar assembly, and electrical control means connected to said solenoid valve means actuating both said assemblies in in-phase relation.

14. The assembly of claim 1, and a second similar assembly, and electrical control means connected to said solenoid valve means for selectively actuating either assembly alone.

15. The assembly of claim 1, and a second similar assembly, and electrical control means connected to said solenoid valve means for selectively actuating either assembly alone, or both assemblies in either in-phase or outof-phase relation.

16. The assemblies of claim 15, and water lubricating and cleaning means comprising a water supply means, water feed means connecting said water supply means to said reciprocable concrete sucking and pumping pistons, a plurality of piston rings on said concrete sucking and pumping pistons bearing against the inner surfaces of said pump cylinders, said concrete sucking and pumping pistons having water conduit means connecting said water feed means to the areas between said piston rings thereon.

17. The assemblies of claim 16, said water feed means including water pressure means and flow control valve means.

18. The assemblies of claim 17, said water feed means in cluding an excess water return conduit connected thereto between said water pressure means and said concrete sucking and pumping piston.

19. The assemblies of claim 18, said water feed means including telescoping water feed tubes connected to said concrete sucking and pumping piston, and telescoping water discharge tubes connected to said piston water conduit means.

20. The assemblies of claim 1, said hydraulic pressure means including a hydraulic fluid reservoir, fluid conduit means connecting said fluid reservoir through said solenoid valve means to said hydraulic cylinders and back to said reservoir, and fluid pressure creating pump means in said fluid conduit means between said reservoir and solenoid valve means.

21. The assemblies of claim 20, said fluid pressure creating pump means including three gear hydraulic pumps, there being one gear hydraulic pump for each said solenoid valve means to said concrete sucking and pumping piston hydraulic cylinder of each assembly, and a third gear pump for both said solenoid valve means to said valve operating hydraulic cylinders of both assemblies.

22. The assembly of claim 1, and manual switch means between said limit switch means and said solenoid valve means for controlling said solenoid valves to stop or reverse actuation of said concrete sucking and pumping piston.

23. The assemblies of claim 15, said electrical control means including manual control means between said limit switch means and said solenoid valve means for controlling said solenoid valve means to selectively stop either assembly while operating the other assembly, or stop either assembly and reverse the other assembly, or reverse both assemblies.

24. The assembly of claim 11, and a powered mobile vehicle on which said assembly is mounted, a power engine and electricity source on said vehicle for transporting said vehicle, and power takeoif means connected to said power engine to operate said hydraulic pressure means and said gear hydraulic pumps, and a circuit connecting said vehicle electricity source to said solenoid valve means and electrical control means there-for.

25. The assemblies of claim 15, said hopper having a double feed spout at the bottom thereof, one spout being connected to said concrete pump cylinder of one assembly and the other spout being connected to said concrete pump cylinder of said other assembly, and a Y-shaped concrete transport conduit having one concrete receiving arm thereof connected to each said pump cylinder and a common concrete feed leg, and a transport conduit means detachably connected to said Y concrete feed leg.

26. The assemblies of claim 25, a cylindrical tank providing one of said fluid supply means, cradle means supporting said cylindrical fluid tank at its ends, said concrete transport conduit means comprising a flexible hose, and a reel rotatably mounted about said cylindrical tank for receiving and storing said flexible concrete transport hose thereon.

27. In a concrete sucking and pushing pump, a pump cylinder and a piston movable therewithin, said piston comprising a front face plate, a spacer, a rear face plate, a pusher plate at the rear of said rear face plate, and stud securing means extending through said front face plate, said spacer, said rear face plate and said pusher plate holding said piston in assembled position, the diameter of said face plates being less than the internal diameter of said pump cylinder but substantially greater than the external diameter of said spacer and said pusher plate thereby providing a channel of substantial depth about said spacer between said face plates, and a forwardly facing nubber cup piston ring mounted on the periphery of each face plate, the uncompressed diameter of each rubber cup piston ring being greater than said internal diameter of said pump cylinder, and water circulating means extending through said piston to the channel about said spacer between said rubber cup piston rings and the inside of said pump cylinder.

28. In the pump of claim 27, said water circulating means comprising water passages extending through said rear face plate and said spacer to the periphery of said spacer.

29. In the pump of claim 28, and water conduits connected to said water passages, a piston connecting rod secured to said pusher plate, hydraulic means for reciprocating said piston connecting rod, and telescopic inner and outer sleeves connecting a water source to said water conduits.

30. In the pump of claim 27, each said face plate periphery having a channel dividing said periphery into front and back lips, each said rubber cup piston ring comprising a rearwardly extending flange internally complementary said channel and lips of the face plate periphery, and a forwardly extending cup portion overlapping an annular portion of the forward face of its face plate and extending outwardly, in uncompressed position, to a diameter greater than said internal diameter of said pump cylinder.

31. In the pump of claim 30, the diameter of said rear face plate lip being greater than that of said front lip, said rearwardly extending flange of said rubber cup piston ring having an annular rear surface in the plane of the rear face of said face plate, the outer periphery of said rubber cup piston ring, in uncompressed position, extending inwardly and forwardly at slightly less than a right angle from said rear annular surface to a diameter still slightly greater than said internal diameter of said pump cylinder at a point forward of said face plate forward face, thence outwardly and forwardly to form an acute angle with a forward annular surface parallel to said rear annular surface, the inner edge of said forward annular surface being substantially equal in diameter to said internal diameter of said pump cylinder, and thence extending inwardly and rearwardly at an acute angle to the 1 1 Y forward face of said face plate at a point substantially inward of the face plate periphery, and thence outwardly in contact with said face plate forward face to said rearwardly extending flange.

References Cited by the Examiner UNITED STATES PATENTS 2,998,781 9/1961 Triebel 103-49 3,068,806 12/1962 Sherrod 103-153 3,128,711 4/1964 Voight et al. 103-45 3,146,721 9/1964 Schwing 103-49 FOREIGN PATENTS 236,490 5/1960 Australia.

References Cited by the Applicant UNITED STATES PATENTS Ellis.

Bailey.

Ball. Longenecker. Ball.

Ball at al.

Ball.

Naef. Shimatani et al. Handl.

15 ROBERT M. WALKER, Primary Examiner. 

1. A HYDRAULIC POWERED CONCRETE PUMP ASSEMBLY COMPRISING A CONCRETE SUPPLY HOPPER, A CONCRETE PUMP CYLINDER, A DISCHARGE CONCRETE CONDUIT, A VALVE SEAT PORT CONNECTING SAID HOPPER TO SAID CONCRETE PUMP CYLINDER, A SECOND VALVE SEAT PORT CONNECTING SAID CONCRETE PUMP CYLINDER TO SAID DISCHARGE CONDUIT, A VALVE OPERABLE BETWEEN POSITIONS OPENING EITHER VALVE SEAT PORT WHILE CLOSING THE OTHER VALVE SEAT PORT, A CONCRETE SUCKING AND PUMPING PISTON IN SAID CONCRETE PUMP CYLINDER, A FIRST HYDRAULIC CYLINDER, A HYDRAULICALLY RECIPROCABLE PISTON IN SAID FIRST HYDRAULIC CYLINDER, A PISTON ROD CONNECTING SAID FIRST HYDRAULIC CYLINDER TO SAID CONCRETE SUCKING AND PUMPING PISTON, A SECOND HYDRAULIC CYLINDER AND HYDRAULICALLY RECIPROCABLE PISTON THEREIN, MEANS LINKING SAID SECOND 